prcomp and princomp

Paul Gilbert
Mon, 24 Aug 1998 12:50:17 -0400

>Ouch. Enough of my students think that it is the spelling already!

Apologies. I thought I had eradicated this.

>This is _not_ what is meant by a scree plot, which plots the singular
>values or eigenvalues.

My mistake here was in the title main="Scree Plot", which in the end was not
what I decided to plot. At one point I thought the default plot method should be
the scree plot, but later decided the default plot method should plot the
principal components.  I noticed that in princomp-add.R you have

plot.princomp <- function(...) screeplot(...)

so perhaps you have different thoughts on this? I would propose having the
default plot the principal components (with the correct title) and use your
function scree, but not as the default.

Paul Gilbert

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